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Empty xylazine bottle found on the streets of Philadelphia (Christopher Moraff / Narcomedia)

How Narcan can saves lives and xylazine can lead to overdose risk

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At a half way house for recovering addicts, supervisors who are in recovery themselves use a fentanyl strip to test for drugs in the urine of a fellow resident on March 22, 2019. (Andrew Lichtenstein/Corbis via Getty Images)

What is fentanyl and why is it behind the deadly surge in overdoses? A medical toxicologist explains

Kavita Babu